Iowa Chapter Director
Join Date: Jul 2002
Location: Ames, Iowa
because the transfer function is specifically tuned to the computer and engine of the vehicle. Using the wrong MAF can screw up the air/fuel mixture and even send the car into "limp" mode (otherwise known as open loop)
Ford did change some of their part numbers but kept the sensor the same. But as far as I know, they only did that with the 80mm Lightning MAF and nothing else. It's a Part Number, it's not different between each sensor, it should be the same.
1988 Notch Mustang: - 438W, direct port n2o, t56
2003 SVT Focus: - SCT X3 tuner